So when Tony Abbott urged Australians to vote no "if you don't like same-sex marriage...if you're worried about religious freedom and freedom of speech... and if you don’t like political correctness", she had something to say.

Appearing on The Project, Christine said her brother was "just plain wrong" when it came to the issue of legalising same-sex marriage.

"They’re all pretty flimsy arguments from Tony, frankly," she told the show's panel.

"He is wrong. He’s just plain wrong.

"Whether or not I marry my partner, Virginia, which we plan to do, it has no impact on Tony."

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When asked if she felt Tony's comments were directed at her personally, Christine said she didn't think her brother "thought of it in those terms".

"But as a gay woman who is in a relationship, who wants to get married, and Tony is well aware of our plans to get married, it's not a really nice thing to hear somebody belittling our plans," she said.